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				How to Play				
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				Frequently Asked Questions				
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				<li><a href="#faq1"> How are queries scored?</a></li>
				<li><a href="#faq2"> How do I improve my score?</a></li>
				<li><a href="#faq3"> What special syntax is available?</a></li>
				<li><a href="#faq4"> Where do these documents and tasks come from?</a></li>
				
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				<li> 
				<a name="faq1"> </a>
				<em>How are queries scored?</em>
				<p>
					Queries are scored according to thier ability to locate relevant documents and avoid irrelevant ones.
					More exactly, a query score is it's <a href="http://en.wikipedia.org/wiki/F-measure#F-measure">f-measure</a>, which combines <i>recall</i> (the proportion of relevant documents that were found) 
					and <i>precision</i> (the proportion of documents found that are relevant).  
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				<li> 
				<a name="faq2"></a>
				<em>How do I improve my score?</em>
				<p>
					Improvements can be made by modifying a query to either retrieve more relevant documents, or fewer irrelevant ones. 
					To catch more documents, you need to add more terms that documents can match to. A good strategy is to think of other ways of 
					saying the same thing, or to look in the relevant documents you have already found for new terms. To avoid irrelevant documents,
					you need to avoid common or ambiguous terms, or use <a href="#faq3">special syntax</a> to restrict how terms can be matched.  
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				<li> 
				<a name="faq3"></a>
				<em>What operators/syntax is available?</em>
				<p>
					The Koru game is built on top of the Lucene search engine and supports the same syntax. 
					Quotes can be used to define phrases, such as "koru game" or "search engine". <i>AND</i> can be used 
					specify that documents must match both the term before it and the term after, while <i>OR</i> specifies 
					that a document can match either. <i>NOT</i> specifies term that documents are not allowed to contain.
					+ and - can define terms that must be matched, or must not be matched, respectively. Brackets can be used 
					to define precidence: i.e. "(Lucene OR Google) AND search" is not the same as "Lucene OR (Google AND search)".
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				<p>
					A detailed description is available <a href="http://lucene.apache.org/java/docs/queryparsersyntax.html">here</a>.
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				<li> 
				<a name="faq4"></a>
				<em>Where do these documents come from?</em>
				<p>
					The documents might seem a little dated and U.S centric; they are all news stories from the New York times, and were released 
					between 1998 and 2000. They are a subset (~3,000 documents) of the <a href="http://www.ldc.upenn.edu/Catalog/CatalogEntry.jsp?catalogId=LDC2002T31">Aquaint newswire corpus</a>. The tasks were gained from
					the <a href="http://ciir.cs.umass.edu/research/hard/">Trec HARD Track</a>, where they were used evaluate the performance of information retrieval systems. 					
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